Method and apparatus for implementing touch key and fingerprint identification, and terminal device

Abstract

An apparatus for implementing touch key and fingerprint identification includes a fingerprint identification sensor arranged below a cover glass of a terminal device and a capacitive touch sensor arranged below the fingerprint identification sensor. The fingerprint identification sensor is configured to collect fingerprint information applied on the cover glass. The capacitive touch sensor is configured to collect a capacitance generated on the cover glass.

What is claimed is: 
     
       1. An apparatus for implementing touch key and fingerprint identification, comprising:
 a fingerprint identification sensor arranged below a cover glass of a terminal device and configured to collect fingerprint information applied on the cover glass; 
 a capacitive touch sensor arranged below the fingerprint identification sensor and configured to collect a capacitance generated on the cover glass; 
 a fingerprint identification circuit coupled to the fingerprint identification sensor, and configured to analyze and process the fingerprint information to obtain a fingerprint analysis result; 
 a capacitive touch circuit coupled to the capacitive touch sensor, and configured to analyze the capacitance to obtain a capacitance variation; and 
 a switch configured to:
 turn on the fingerprint identification sensor and the fingerprint identification circuit and disconnect the capacitive touch sensor and the capacitive touch circuit according to a turn-on signal, and 
 turn on the capacitive touch sensor and the capacitive touch circuit and disconnect the fingerprint identification sensor and the fingerprint identification circuit according to a cut-off signal, 
 
 wherein the fingerprint identification sensor comprises multiple layers of circuits providing a shielding function reducing capacitive touch signals, the multiple layers of circuits being in a float status when the switch receives the cut-off signal, and the capacitive touch sensor has a high signal-noise-ratio. 
 
     
     
       2. The apparatus of  claim 1 , further comprising:
 a host processor coupled to the switch and the capacitive touch circuit, the host processor being configured to:
 send the turn-on signal or the cut-off signal to the switch, 
 perform an authentication according to the fingerprint analysis result, and 
 judge whether the cover glass receives a touch key operation according to the capacitance variation. 
 
 
     
     
       3. The apparatus of  claim 2 , wherein the host processor includes:
 a communication interface configured to send the turn-on signal or the cut-off signal to the switch; 
 a first processor coupled to the switch and configured to compare the fingerprint analysis result with pre-stored fingerprint data to determine an identity of a current user; and 
 a second processor coupled to the capacitive touch circuit and configured to judge whether the capacitance variation exceeds a predefined value to determine whether the cover glass receives the touch key operation. 
 
     
     
       4. The apparatus of  claim 1 , wherein the fingerprint identification sensor is configured to be in a float status when the fingerprint identification sensor and the fingerprint identification circuit are disconnected. 
     
     
       5. A terminal device, comprising the apparatus of  claim 1 . 
     
     
       6. A terminal device, comprising the apparatus of  claim 2 . 
     
     
       7. A terminal device, comprising the apparatus of  claim 3 . 
     
     
       8. A terminal device, comprising the apparatus of  claim 4 . 
     
     
       9. A method for implementing touch key and fingerprint identification, comprising:
 collecting, when a turn-on signal is received, fingerprint information applied on a cover glass by a fingerprint identification sensor, and analyzing and processing the fingerprint information to obtain a fingerprint analysis result by a fingerprint identification circuit coupled to the fingerprint identification sensor; and 
 collecting, when a cut-off signal is received, a capacitance generated on the cover glass by a capacitive touch sensor, and analyzing the capacitance to obtain a capacitance variation by a capacitive touch circuit coupled to the capacitive touch sensor, 
 wherein the fingerprint identification sensor comprises multiple layers of circuits providing a shielding function reducing capacitive touch signals, the multiple layers of circuits being in a float status when the cut-off signal is received, and the capacitive touch sensor has a high signal-noise-ratio. 
 
     
     
       10. The method of  claim 9 , further comprising:
 performing an authentication on the fingerprint analysis result. 
 
     
     
       11. The method of  claim 10 , wherein performing the authentication includes:
 comparing the fingerprint analysis result with pre-stored fingerprint data to determine an identity of a current user. 
 
     
     
       12. The method of  claim 9 , further comprising:
 judging whether the cover glass receives a touch key operation according to the capacitance variation. 
 
     
     
       13. The method of  claim 12 , wherein judging whether the cover glass receives the touch key operation includes:
 judging whether the capacitance variation exceeds a predefined value; and 
 determining that the cover glass receives the touch key operation if the capacitance variation exceeds the predefined value. 
 
     
     
       14. An apparatus for implementing touch key and fingerprint identification, comprising:
 a processor; and 
 a memory storing instructions that, when executed by the processor, cause the processor to:
 collect, when receiving a turn-on signal, fingerprint information applied on a cover glass by a fingerprint identification sensor, and analyze and process the fingerprint information to obtain a fingerprint analysis result by a fingerprint identification circuit coupled to the fingerprint identification sensor; and 
 collect, when receiving a cut-off signal, a capacitance generated on the cover glass by a capacitive touch sensor, and analyze the capacitance to obtain a capacitance variation by a capacitive touch circuit coupled to the capacitive touch sensor, 
 
 wherein the fingerprint identification sensor comprises multiple layers of circuits providing a shielding function reducing capacitive touch signals, the multiple layers of circuits being in a float status when the cut-off signal is received, and the capacitive touch sensor has a high signal-noise-ratio.